Hammer



FIG. 1 is a side elevational view of the hammer showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a rear perspective view thereof.

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a front perspective view thereof; 

The ornamental design for a hammer, substantially as shown and described. 